Patent GB-545383-A (GB)
Title: Temperature regulator
IPC: G05D23/12
Filed: 1940-10-05
Abstract: 545,383. Thermostats. WILCOLATOR CO. Oct. 5, 1940, No. 14914. Convention date, Oct. 11, 1939. [Class 135] [Also in Group XXIV] A thermostat fitted with a cut-off valve and a temperature regulating valve has the adjusting means for the temperature regulating valve mounted in the cut-off valve so that the adjusting means, cut-off and regulating valves may be readily removed as a unit from the main casing. In the form shown the cut-off valve comprises a conical plug 12 held to its seat by a spring 56 arranged between the larger end of the plug and a washer 57 with a key 57<SP>1</SP> engaging a key-way 58 in a tubular extension 18 of the plug and bearing against a cover 59 having projections and hooks secured by headed screws to recessed lugs on the casing. The actuating handle 72 for cutoff valve is formed with lugs 73 engaging slots 71 in a cylindrical extension on a hub 63 slidably mounted on the extension 18 and provided with a key 63<SP>11</SP> engaging the key-way 58. One of the lugs 73 is made larger than the other so that the handle can only be secured in one position to the hub. A combined stop and lock plate 66 is secured by screws to the hub 63 and is provided with stop projections to co-operate with a stop finger on the cover 59 and with a notch adapted to be moved by a spring 65 into locking engagement with a locking projection on the stop finger in the closed position of the cock. The thermally-actuated valve co-operates with a seat on the end of the plug and has a screwthreaded engagement with a tubular spindle 25 slidably mounted on a spindle 21 and normally held in contact with a collar 23 on the spindle 21 by a spring 24. The spindle 21 is guided by the collar 23 and spindle and engaging bores in a tubular adjusting spindle 19 rotatably mounted in the extension 18 by a shoulder 20 and a thrust washer 75 secured by a split ring. Rotation of the valve is prevented by a pin 30 engaging a key-way 31 and rotation of the spindle 25 is prevented by a pin 26 engaging a key-way 261. Lateral movement of the valve member is prevented by lugs on the casing. The adjusting knob 83 is clamped to a boss 77 by a plate 80 with a key engaging a key-way 81 and screws 82 masked by a plate 86. The boss is secured to the spindle 19 by a ring 78 engaging a groove in the boss and one of a series of grooves in the spindle. The axial position of the handle may be adjusted by inserting a spring ring (not shown) in one of a series of grooves 73. The regulating valve is actuated by a thermal bellows 50 mounted on a cover plate 43 secured over a side aperture in the casing and connected by a capillary tube with a thermal feeler. Movement of the closed end of the bellows is transmitted through a headed pin 53 held against the bellows by a spring 54 and a bi-metallic bell-crank lever 40 to a cap 34 secured to the end of the spindle 21. A spring 36 normally transmits this movement to the regulating valve. Further movement of the ball-crank after the valve has seated merely compresses the springs 24, 36. A detachable plug 321 is provided to permit lubricant to be forced into a recess 32 to lubricate the screw-connections. A further passage 90 in the cut-off valve may lead to a passage 91 fitted with auxiliary plugs to provide a byepass to the regulating valve and a supply to a pilot burner.